Merge remote-tracking branch 'remotes/edgar/tags/edgar/cris-next-2021-02-22.for-upstr...
[qemu.git] / block / win32-aio.c
1 /*
2 * Block driver for RAW files (win32)
3 *
4 * Copyright (c) 2006 Fabrice Bellard
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a copy
7 * of this software and associated documentation files (the "Software"), to deal
8 * in the Software without restriction, including without limitation the rights
9 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
10 * copies of the Software, and to permit persons to whom the Software is
11 * furnished to do so, subject to the following conditions:
12 *
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
15 *
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
22 * THE SOFTWARE.
23 */
24
25 #include "qemu/osdep.h"
26 #include "qemu/timer.h"
27 #include "block/block_int.h"
28 #include "block/aio.h"
29 #include "block/raw-aio.h"
30 #include "qemu/event_notifier.h"
31 #include "qemu/iov.h"
32 #include <windows.h>
33 #include <winioctl.h>
34
35 #define FTYPE_FILE 0
36 #define FTYPE_CD 1
37 #define FTYPE_HARDDISK 2
38
39 struct QEMUWin32AIOState {
40 HANDLE hIOCP;
41 EventNotifier e;
42 int count;
43 AioContext *aio_ctx;
44 };
45
46 typedef struct QEMUWin32AIOCB {
47 BlockAIOCB common;
48 struct QEMUWin32AIOState *ctx;
49 int nbytes;
50 OVERLAPPED ov;
51 QEMUIOVector *qiov;
52 void *buf;
53 bool is_read;
54 bool is_linear;
55 } QEMUWin32AIOCB;
56
57 /*
58 * Completes an AIO request (calls the callback and frees the ACB).
59 */
60 static void win32_aio_process_completion(QEMUWin32AIOState *s,
61 QEMUWin32AIOCB *waiocb, DWORD count)
62 {
63 int ret;
64 s->count--;
65
66 if (waiocb->ov.Internal != 0) {
67 ret = -EIO;
68 } else {
69 ret = 0;
70 if (count < waiocb->nbytes) {
71 /* Short reads mean EOF, pad with zeros. */
72 if (waiocb->is_read) {
73 qemu_iovec_memset(waiocb->qiov, count, 0,
74 waiocb->qiov->size - count);
75 } else {
76 ret = -EINVAL;
77 }
78 }
79 }
80
81 if (!waiocb->is_linear) {
82 if (ret == 0 && waiocb->is_read) {
83 QEMUIOVector *qiov = waiocb->qiov;
84 iov_from_buf(qiov->iov, qiov->niov, 0, waiocb->buf, qiov->size);
85 }
86 qemu_vfree(waiocb->buf);
87 }
88
89 waiocb->common.cb(waiocb->common.opaque, ret);
90 qemu_aio_unref(waiocb);
91 }
92
93 static void win32_aio_completion_cb(EventNotifier *e)
94 {
95 QEMUWin32AIOState *s = container_of(e, QEMUWin32AIOState, e);
96 DWORD count;
97 ULONG_PTR key;
98 OVERLAPPED *ov;
99
100 event_notifier_test_and_clear(&s->e);
101 while (GetQueuedCompletionStatus(s->hIOCP, &count, &key, &ov, 0)) {
102 QEMUWin32AIOCB *waiocb = container_of(ov, QEMUWin32AIOCB, ov);
103
104 win32_aio_process_completion(s, waiocb, count);
105 }
106 }
107
108 static const AIOCBInfo win32_aiocb_info = {
109 .aiocb_size = sizeof(QEMUWin32AIOCB),
110 };
111
112 BlockAIOCB *win32_aio_submit(BlockDriverState *bs,
113 QEMUWin32AIOState *aio, HANDLE hfile,
114 uint64_t offset, uint64_t bytes, QEMUIOVector *qiov,
115 BlockCompletionFunc *cb, void *opaque, int type)
116 {
117 struct QEMUWin32AIOCB *waiocb;
118 DWORD rc;
119
120 waiocb = qemu_aio_get(&win32_aiocb_info, bs, cb, opaque);
121 waiocb->nbytes = bytes;
122 waiocb->qiov = qiov;
123 waiocb->is_read = (type == QEMU_AIO_READ);
124
125 if (qiov->niov > 1) {
126 waiocb->buf = qemu_try_blockalign(bs, qiov->size);
127 if (waiocb->buf == NULL) {
128 goto out;
129 }
130 if (type & QEMU_AIO_WRITE) {
131 iov_to_buf(qiov->iov, qiov->niov, 0, waiocb->buf, qiov->size);
132 }
133 waiocb->is_linear = false;
134 } else {
135 waiocb->buf = qiov->iov[0].iov_base;
136 waiocb->is_linear = true;
137 }
138
139 memset(&waiocb->ov, 0, sizeof(waiocb->ov));
140 waiocb->ov.Offset = (DWORD)offset;
141 waiocb->ov.OffsetHigh = (DWORD)(offset >> 32);
142 waiocb->ov.hEvent = event_notifier_get_handle(&aio->e);
143
144 aio->count++;
145
146 if (type & QEMU_AIO_READ) {
147 rc = ReadFile(hfile, waiocb->buf, waiocb->nbytes, NULL, &waiocb->ov);
148 } else {
149 rc = WriteFile(hfile, waiocb->buf, waiocb->nbytes, NULL, &waiocb->ov);
150 }
151 if(rc == 0 && GetLastError() != ERROR_IO_PENDING) {
152 goto out_dec_count;
153 }
154 return &waiocb->common;
155
156 out_dec_count:
157 aio->count--;
158 out:
159 qemu_aio_unref(waiocb);
160 return NULL;
161 }
162
163 int win32_aio_attach(QEMUWin32AIOState *aio, HANDLE hfile)
164 {
165 if (CreateIoCompletionPort(hfile, aio->hIOCP, (ULONG_PTR) 0, 0) == NULL) {
166 return -EINVAL;
167 } else {
168 return 0;
169 }
170 }
171
172 void win32_aio_detach_aio_context(QEMUWin32AIOState *aio,
173 AioContext *old_context)
174 {
175 aio_set_event_notifier(old_context, &aio->e, false, NULL, NULL);
176 aio->aio_ctx = NULL;
177 }
178
179 void win32_aio_attach_aio_context(QEMUWin32AIOState *aio,
180 AioContext *new_context)
181 {
182 aio->aio_ctx = new_context;
183 aio_set_event_notifier(new_context, &aio->e, false,
184 win32_aio_completion_cb, NULL);
185 }
186
187 QEMUWin32AIOState *win32_aio_init(void)
188 {
189 QEMUWin32AIOState *s;
190
191 s = g_malloc0(sizeof(*s));
192 if (event_notifier_init(&s->e, false) < 0) {
193 goto out_free_state;
194 }
195
196 s->hIOCP = CreateIoCompletionPort(INVALID_HANDLE_VALUE, NULL, 0, 0);
197 if (s->hIOCP == NULL) {
198 goto out_close_efd;
199 }
200
201 return s;
202
203 out_close_efd:
204 event_notifier_cleanup(&s->e);
205 out_free_state:
206 g_free(s);
207 return NULL;
208 }
209
210 void win32_aio_cleanup(QEMUWin32AIOState *aio)
211 {
212 assert(!aio->aio_ctx);
213 CloseHandle(aio->hIOCP);
214 event_notifier_cleanup(&aio->e);
215 g_free(aio);
216 }